quay/conf/init/v3_migration.py

from app import app
from active_migration import ActiveDataMigration

if not app.config.get('SETUP_COMPLETE', False):
  print 'head'
else:
  v3_upgrade_mode = app.config.get('V3_UPGRADE_MODE')
  if v3_upgrade_mode == 'background':
    raise Exception('V3_UPGRADE_MODE must be "complete". This requires a full upgrade to Quay:v3.0. See https://access.qa.redhat.com/documentation/en-us/red_hat_quay/3/html/upgrade_quay/index')
  elif v3_upgrade_mode == 'production-transition':
    print '481623ba00ba'
  elif v3_upgrade_mode == 'post-oci-rollout' or v3_upgrade_mode == 'post-oci-roll-back-compat' or v3_upgrade_mode == 'complete':
    if ActiveDataMigration is not None:
      print ActiveDataMigration.alembic_migration_revision
    else:
      print 'head'
  else:
    raise Exception('Unknown V3_UPGRADE_MODE: %s' % v3_upgrade_mode)